Why is it burning

I recently had unprotected sex with someone and did not pee after and was holding it in for more then 8 hours, 2 days later i wasnt able to pee it was just a little drips but it would burn, i figured it was most likely a uti. I didnt panic i just drunk plenty of fluids to try and flush it out. After 5 days i was able to pee normally but it would burn once im done. Goin on a week and 2 days i still get the burning feelings but there no smell, no discoloration, my discharge was just creamy white. Im hoping its not a std can anyone help?